Cauda:
long and narrow, strongly bent in ventral direction. The tip curves in the anterior direction. The area situated between the posterior part of the ostial crista inferior and the recurved portion of the cauda is much wider than the maximal diameter of the;

Ostium:
nearly circular and very small;

Excisura:
very narrow, notch absent;

Antirostrum:
rounded;

Rostrum:
reduced;

Ventral depression:
absent;

Dorsal depression:
shallow and elongate;

Crista inferior:
poorly developed under ostium, moderately well developed along sulcus;

Crista superior:
poorly developed over ostium, ridge-like over horizontal portion of the cauda;